Perhaps you should try some spelling variations:
"literatura arabe de islam." » "literatura breve de islam.", "literatura de de islam.", "literatura e de islam.", "literatura caribe de islam.", "literatura sabe de islam.", "literatura arabes e islam.", "literatura arabe del islam.", "literatura arabe de isla.", "literatura arabe e islam."
"literatura arabe el or arabe en islam." » "literatura arabe e or arabe en islam.", "literatura arabe et or arabe en islam.", "literatura arabes del or arabe en islam.", "literatura arabe el or caribe en islam.", "literatura arabe el or mabe en islam.", "literatura arabe el or arabes e islam."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura arabe de islam.") or ("literatura ((arabe el) or (arabe en)) islam."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura arabe de islam.") OR ("literatura ((arabe el) or (arabe en)) islam.")).
• Removing quotes may allow a broader search: (( literatura arabe de islam. ) or ( literatura ((arabe el) or (arabe en)) islam. )).
• Adding a wildcard symbol may retrieve word variants: (("literatura arabe de islam.") or ("literatura ((arabe el) or (arabe en)) islam."))*.